package com.woniu.demo.filter;

import com.woniu.demo.utils.StreamUtil;

import javax.servlet.ReadListener;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStreamReader;


/**
 * 复制request中的bufferedReader中的值
 *
 * @date 2016年9月1日  上午10:53:06
 */
public class RequestWrapper extends HttpServletRequestWrapper {

    private final byte[] body;

    /**
     * 这个必须加,复制request中的bufferedReader中的值
     *
     * @param request
     * @throws IOException
     */
    public RequestWrapper(HttpServletRequest request) throws IOException {
        super(request);
        body = StreamUtil.getByteByStream(request.getInputStream());

    }

    @Override
    public BufferedReader getReader() throws IOException {
        return new BufferedReader(new InputStreamReader(getInputStream()));
    }

    @Override
    public ServletInputStream getInputStream() throws IOException {
        final ByteArrayInputStream bais = new ByteArrayInputStream(body);
        return new ServletInputStream() {

            public boolean isFinished() {
                return false;
            }

            public boolean isReady() {
                return false;
            }

            public void setReadListener(ReadListener readListener) {

            }

            @Override
            public int read() throws IOException {
                return bais.read();
            }
        };
    }

}
